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Note on size variation of body and statoliths in the oval squid Sepioteuthis lessoniana hatchlings

Published online by Cambridge University Press:  01 August 1999

Yuzuru Ikeda ,
Yozo Wada ,
Nobuaki Arai  and
Wataru Sakamoto
Yuzuru Ikeda
Affiliation:
Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan Present address: Brain Science Institute, The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan
Yozo Wada
Affiliation:
Kyoto Institute of Oceanic and Fishery Science, Miyazu, Kyoto 626–0052, Japan
Nobuaki Arai
Affiliation:
Division of Social Informatics, Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan
Wataru Sakamoto
Affiliation:
Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
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Abstract

Oval squid Sepioteuthis lessoniana hatchlings originated from maternally identical egg strings were incubated under constant temperature and examined with special reference to statolith formation. Statoliths of a hatchling already had an adult-like shape, and some increments were observed. In spite of the maternally identical origin and constant incubation temperature (25°C), dorsal mantle length and statolith length of the hatchlings varied from 4.70 to 6.26 mm and 320 to 410 μm, respectively (N=14). These variations had a positive correlation with the embryonic duration ranging from 22 to 27 d, which means that the size of body and statolith becomes larger in hatchlings hatching later.

Type
SHORT COMMUNICATION
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 79 , Issue 4 , August 1999 , pp. 757 - 759
Copyright
© 1999 Marine Biological Association of the United Kingdom

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